Are colt 1911 guns magazine brand specific?

There are aftermarket magazines available for the Colt 1911, but the original Colt magazines are not brand specific. In other words, any reputable magazine manufacturer produces magazines that will work in a Colt 1911. However, it’s important to check the dimensions of the replacement magazine against those of the original magazine to make sure they are compatible. There are also some Colt 1911s that come with extended magazines, so be sure to check the specifications of the replacement magazine before making a purchase.